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I MULTIPLE BAKERS OVEN. APPLICATION FILED MAR. 3,|I9I9.

PatentedMay 11, 1920..

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MULTIPLE BAKERS OVEN. APPLICATION min MAR. 3. 1919.

Patented May 11, 1920.

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o. WUNDRACK. MULTIPLE BAKERS OVEN. APPLICATION FILED MAR. .3| i919.

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UNITED ISTATES PATENT OFFICE.

I OTTO WUNDRAOK, or MAYWOOD, ILLINOIS, AssI'GNOa To P'ETnnsEN OVEN COMPANY,

0F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

MULTIPLE BAKERS OVEN.

Specification of Letters Patent.

Patented May 11, 1920.

substitute for application serial Noi 148,555, filed February 14, l1917. This application med Maron 3,

` 1919. Serial No. 280,384.

To allpwhom it may concern .W Be it known that I, OTTO WUNDRAOK, a citizen of the United States, residing at Maywood, 'in the county of Cook and State of Illinois, have invented new and useful Improvements in Multiple Bakers Ovens,-

was limited to its predetermined estimatedy capacity, and if it were desired to increase this capacity the oven had to be torn down and rebuilt, or additional independent ovens installed.

The object of my invention is to build amultiple bakers oven of several correspond-- ing oven-units, each of which is complete in itself and yet can have another unit or units added thereto in alinement to increase the capacity and expedite the work thereofl as desired. A further object is to accomplish a saving of fuel when the oven has two or more units by allowing the furnace in one unit to die out and utilize the heat generated in the other units to heat the entire oven structure. This I accomplish by the means hereinafter fully described, and as particularly pointed out in the claims.

In the drawings:

Figure 1 is a longitudinal vertical section of a single unit of my improved multiple bakers oventaken on dotted line l, l, Fig. 3.

Fig. 2 is a similar section of several of said units assembled into one continuous oven, drawn to a smaller scale.

Fig. 3 is a transverse vertical section taken on dotted line 3 3, Fig. 1.

Referring to the drawings, A represents the front-wall of the front unit of my improved bakers oven; B, B, the side-walls thereof; C the roof, andD the rear end wall of the same. This front oven unit is built on a suitable foundation and is partially surrounded by a suitable areaway and is heated by two ,transversely arranged furnaces; one, a, is built partly below the plane of the foundation of the oven just back of the frontwall, and the other, I), is built in about the same level in about the same relative position, to the rear end-wall D of the same. Furnace ,a is generally used to assist in raising the temperature to obtain thedesired heat to start the oven, and it `is customary just as soon as the rear furnace is operating satisfactorily and the temperature of the oven is high enough to let the front furnace die out. At the left hand end -of these furnaces (which terminate about midway between the side-Walls of the oven) their side-walls and a-rches terminate and dischargeY into the longitudinally disposed heat-chamber E, which latter is arched over by a suitable arch c, and the heated'products of combustion discharge therefrom through a verticalvalve controlled flue d into an ante-chamber e located over the entrance of the bakingchamber of the oven right back of the front- .vvall thereof.

. The roof of this ante-chamber is `provided with a suitable opening up through which the products of combustion candischarge into the horizontal chimney-flue that extends immediately above the roof of the oven and leads direct to the chimney (not shown). This opening is closed by a plate-valve F that has a suitable rod extending longitudinally therefrom out through the front-wall and terminates in a suitable handle that can be grasped to operate the valve whenever desired. This antechamber; when valve F is closed, discharges rearwardly into a series of longitudinal tubes G that extend through the upper portion of'and practically form the ceiling of the baking-chamber H, and the rear ends of these tubes discharge into dischargechamber g. Chamber g has an opening in its ceiling by means of which said chamber can communicate directly with flue f that leads to the chimney, and a horizontal platevalve 7L which is movable transversely, closes or controls the area of this opening.l

Front-wall A of the oven is provided with a transversely arranged series of longitudinally extending openings therein that aline with tubes Gr and thefront ends of these openings are closed by 'suitable covers z' by removing which access can be had to said is closed by a suitable cover 7c. At a suitable point betweenl its ends, passage I has a vertically disposed transverse plate-valve .K therein which is reciprocable transversely to control the opening of said passage.

The baking-chamber H extends from one end to the other of the oven-units, and it is open at both ends, and between this bakingchamber and heating-chamber E there is a longitudinally disposed reheating-chamber J which extends the entire length of. the oven-unit just. above arch c and'is open at both endsf Both the baking-chamber and the reheatingfch'amber of the front unit have tracks m, n, respectively, the-ends of which when said unit is alone used extend out of the open ends of the baking-chamber and reheating-chamber a short distance. A suitably constructed traveling hearth (Which, together with conjunctive devices, is made the subject-matter of an application for Letters Patent of the United States filed March 15, 1919, Serial No. 282,898) is'supported on these tracks as it travels rearwardly through the baking-chamber and returns forwardly through the reheatingchamber. Thel ends of this endless hearth pass around suitable sprocket-wheels M, N,

respectively, which latter areA inclosed with- I in rectangular shaped housings O, P, in order to prevent the escape of the heat. The details of construction of these housings are immaterial in so far as myinvention is concerned.

The rearwall of the oven just above the plane of furnace b is provided with a longitudinal passage Q, which is providedwith a transversely movable valve-plate R, and has its rear end closed by a suitable cover g. When it is desired to enlarge and increase the capacity of this front oven-unit, the

rear-wall of the same is utilized as the frontwall of the added rear oven-unit, -which latter, as shown in Fig. 2 of the drawings, is constructed so as to provide a rearwardly extending continuation 4' of the chimneyflue f. The roof 5 of this-added oven-unit is in the same plane as roof C ofthe front unit and arches over the baking-chamber 6, which latter corresponds to and is a continuation of baking-chamber H of the. for wardmost unit and extends through its own rear-wall 7. This rear unit also has areheating-chamber 8 which corresponds with and forms a continuation of reheatingchamber J of the front oven-unit, and it also extends through its rear-wall 7 and is open at its rear end. This rear oven-unit is also provided with a heat-chamber 9 which receives the heated products-of combustion from a transversely disposed furnace 10 adjacent rear-Wall 7 thereof, which is built in the same level as furnaces a and I) of the forward oven-unit and corresponds in construction thereto.

When passage Q is closed by valve R the products of combustion from heat-chamber 9 dischar es into a vertical valve-controlled lue 12, t e lower end of which is o enl t0 chamber 9 immediately to the rear o rearwall D of the front oven-unit. This vertical flue extends up through the side-wall of the rear unit of the oven and discharges 'at its upper end into a transversely disposed ante-chamber` 13, the dimensions of which,

preferably, correspond to chamber to which latter it is. connected by passa e I. The top of this ante-chamber 13 is c osed by a transversely movable valve 14v that corresponds in `construction to valve h of receiving-chamber g, and chamber 13 is connected by a series of longitudinally7 disposed4 tubes 15 correspondingto 'tubes g) to a discharge-chamber 16 built in the furnace structure above the dischar e end of baking-chamber 6. Discharge-c amber 16 discharges into flue 4 immediately in front of rear-wall 7 of the rear oven-unit, and this discharge is controlled by a horizontally disposed laterally movable plate-valve 17 that corresponds in construction and. operation to late-,valve 14.

en it is desired to operate the multiple bakersoven shown in Fig. 2l of the drawings, furnaces a, b and 10 are started, and at first the products of^ combustionjfrom furnace a discharge into verticalflu'e d in the side-Wall op osite the entrance to fui'- nace a, and ldiscli j the oppositely located lower end of a vertical valve-controlled flue S, which latter extends through the same side-wall in which flue d is made, and discharges into one endy of exit-chamber g, and the products of com,- bustion from furnace 10' dlscharge into the lower end of a vertically disposed valvecontrolled flue 18 which is made in the same side-wall as lues e and S and `from thence into one end of the transverse exit-chamber 16.

After the oven has'A become suiciently heated, valves K and R are opened and flues S, 12 and 18 are closed by plate-valves similar to that in flue d, but not shown in the drawings, and valves F, It and 14 are closed and valve 17 opened, whereupon the heated products of combustion from furnaces 10 and?) will flow forward through heatingchambers 9 and E up through flue d into ante-chamber F and from thence rearwardly through tubes G- that heat the baking-oven of the front oven-unit and rearwardly through chambers'g and 13, and tubes 15.

arge from furnace b -into chimney. After the oven has become suficiently heated, furnace a is permitted to die out, and the heat from furnaces b and 10 are depended upon to obtain the necessary temperature for the baking and reheating chambers of the oven. In very warm weather furnace b may also be permitted to die out and the heat from furnace 10 can be relied upon to provide the necessary heat for the oven.

From the construction of my improved multiple oven, as hereinbefore described and as illustrated in the drawingsit will be apparent that valves K and R can Abe closed and valve h opened and the front oven-unit be operated. without the rear oven-unit, or, if desired, the front oven-unit could be cutout by closing valves K and R and the rear unit be operated. It is also apparent that, if desired, a third oven-unit could be added to the oven structure in the same manner as vthe rear unit, hereinbefore described and as illustrated in the drawings. By increasing the length -`of the oven by the additional oven-units it is possible for a baker to first build the forvvard-unit and rely upon it for his output until he is financially able to add a secondy oven-unit thereto, and so on, for the longer the oven the more bakery goods can be baked with a relatively greater'economy in time and fuel than could possibly being chambers that return forward through said reheating-chamber.

2. A bakers oven comprising a plurality of longitudinally alined communicating oven-units in one continuous structure separated by a common transverse wall each having a baking-chamber and a reheatingchamber extending longitudinally therethrough which communicate and aline with similar chambers in the next oven-unit, suitable communicating heating devices in one of said units, communicating heat distributing devices therefor, andv means for conveying bakery goods rearwardly through the baking chambers that return forward through said reheating-chamber.

3. A bakers oven comprising a plurality of longitudinally alined communicating oven units separated by a common transsol baking-chambers and forward insaid reheating chambers.

4. A bakers oven comprising a plurality of longitudinally communicating ovenunits, alining baking-chambers and reheating-chambers extending therethrough, longitudinally disposed heatchambers in each of said oven-units below' the reheating-chambers thereof, a valve controlled passage connecting said heat chambers, suitable heat generators that discharge into the latter, and a traveling hearth adapted tov movethrough said baking and reheating chambers.

5. A bakers oven comprising a plurality of longitudinally communicating ovenunits, alining baking-chambers and reheating chambers extending longitudinally therethrough, longitudinally disposed heatchambers in each of said oven-unitsibelow the reheating-chambers thereof that are connected by a valve-controlled passage, a heat distributing system in each of said units connected with said heat-chambers, and a traveling hearth adapted to move through said baking and reheating chambers.

6. A bakers oven comprising a plurality of longitudinally communicating ovenunits, baking-chambers and reheating-chambers in each of said units which when said units are connected aline` and extend longitudinally through the oven structure, longitudinally disposed. heat-chambers in each unit arranged below said reheating-chambers, a heat distributing system for each unit arranged below said reheating-chambers, a heat distributing system for each unit which is connected to said heat-chambers and has valve-controlled communication with each other and with a suitable chimney-iue, said chimney-Hue and an endless hearth adapted to move through said baking-chambers and reheating chambers.

7 A bakers oven comprising a plurality of longitudinally communicating oven-units, baking-chambers and reheating-chambers in each of said units which when said units are connected aline and extend longitudinally through the oven structure, longitudinally disposed heat-chambers in each unit arlongitudinally ranged below said reheating-chambers, a valve-controlled passage connecting the same, a heat distributing system for each unit which is connected to said heat-cham- 5 bers and has valve-controlled communication with each other and with a suitable chimneyflue, said chimney-flue,and an endless hearth adapted to move through said baking-chambers and reheating-chambers'. v8. A. bakers oven comprising a plurality ofxlongitudinally communicating oven-units, baking-chambers and reheating-chambers in Weach of said units which when said units are connected aline and extend longitudinally l5 through thel oven structure, longitudinally.

disposed heat-chambersV in each unit arranged below said reheating-chambers, a suitable heat generator adjacent the rear of each of the same, a heat distributing system for each unit which is connected to said heatchambers, and a valve in the communicating passage between said chambers, and a suitable chimney-ue for each4 heat chamber, said chimney-flue and an endless hearth adapted to move through said baking-chambers and reheating-chambers. y

9. A bakers oven comprising a plurality of longitudinally communicating oven-units, baking-chambers and reheating-chambers in each yoi. said units which when said units are connected 'aline and extend longitudinally through the oven structure, longitudinally disposed heat-chambers in each unit arranged below said reheating-chambers, heat generators in each of the same, a passage connecting saidy heat-chambers,l a valve therein controlling the same, a heat distributing system for eachunit which is connected to said heat-chambers, and a valve 40 controlled passage between the adjacent ends of the same and a superposed chimneyflue, said chimney-flue, and an endless hearth adapted to move through said baking-chambers and reheating-chambers.

10. A bakers oven comprising a plurality of longitudinally alined communicating oven-units, a common transverse wall separating the same,I communicating baking-| chambers and reheating-chambers below the same in each of said units thaty aline and eX- tend through said ovens, longitudinally disposed communicating heat-chambers in each unit below the reheating-chambers, communicating heat radiating devices in said baking-chamber, vertical flues connecting the forward portion of -each of said heatingchambers'and said heat radiating devices, heat generators in said heat-chambers, and an endless traveling hearth movable through said baking-chamber and said reheating chamber.

11. A bakers oven comprising a plurality of longitudinally communicating oven-units, a baking-chamber and a reheating-chamber below the same in each of said units, a chimunits, a baking-chamber and a reheating chamber below the same in each .of said units, 4a chimney-flue above said bakingchamber, an ante-chamber above the entrance of the baking-chamber, heat distributing devices for said baking-chamber communicating with saidante-chamber, a valvecontrolled opening connecting said antechamber and chimney-flue, a valvecontrolled passage connecting the heat distributing devices. of the front oven-unit with the ante-chamber of the second oven-unit, a heatchamber below said reheating-chamber,

valve-controlled yertical fines connecting the said heat-chamber with said ante-chamber, ,and .an endless traveling hearth movable 1tt)hrough said baking and reheating-chamers. l

13. A bakers oven comprising a plurality of longitudinally communicating ovenunits, a baking-chamber and a reheatin chamber below the same in each of sa d units, a chimney-flue above said bakingchamber, an ante-chamber above the entrance of the baking-chamber, heat distributing devices for said baking-chamber communicating with said ante-chamber, a discharge-chamber in each unit into which the heat distributing devices thereof discharge, a valve-controlled opening connecting said ante-chamber and chimney-flue, a heat chamber below said reheating-chamber, valve-controlled vertical flues connecting the said heat-chamber with said ante-chamber, and an endless traveling hearth movable through said baking and reheating chambers.

14:. A bakers oven comprising a plurality of longitudinally communicating ovenunits, a baking-chamber and a reheatingchamber below the same in each of said units, a lchimney-flue above said bakingchamber, an ante-chamber above the entrance of the baking-chamber, heat distributing devices for sald baking-chamber communlcating with said ante-chamber, a. discharge chamber in each unit into which the heat distributing devicesv thereof discharge, a valve-'controlled opening connecting said lante-chamber and chimney-flue, a valve-controlled passage Aconnecting the dischargechamber of the forward oven unit to the .iseaeie ante-chamber of the `following unit, a heatchamber below said reheating-chamber, valve-controlled vertical lues connecting the said heat-chamber with said ante-chamber, and an endless traveling hearth movable through said baking and reheating chambers.

15. A bakers oven comprising a plurality of longitudinally communicating ovenunits, a baking-chamber and a reheatingchamber below the same in each of said units, a chimney-flue above said bakingchamber, an ante-chamber above the entrance of the baking-chamber, heat distribbuting devices for said baking-chamber communicating with said ante-chamber, a discharge-chamber in each unit into which the heat distributing devices thereof discharge, valve controlled openings connecting said' discharge chambers with said chimney-lue, a valve-controlled opening connecting said ante-chamber and chimney-flue, a heat-chamber below` said reheating-chamber, valve controlled vertical lues connecting the said heat-chamber with said antechamber, and an endless traveling hearth movable through said baking and heating chambers.

16. A bakers oven comprising a pluralityof longitudinally communicating oven units, a baking-chamberand a reheatingchamber below the same in each of said units, a chimney-flue above ysaid bakingchamber, an ante-chamber above the en-.

trance vof the baking-chamber, heat Vdistributing devices for said baking-chamber communicating with said ante-chamber, a discharge chamber in each unit into Awhich the heat distributing devices thereof discharge, valve controlled openings connecting said discharge chamberswith said chimney Hue, a valve controlled opening connecting said ante-chamber and chimney-flue, a valve-controlled passage connecting the dischargechamber of the forward oven unit to the ante-chamber of the following unit, a heatchamber below said reheating-chamber, valve-controlled vertical ues connecting the said heat chamber with said ante-chamber, and an endless traveling hearth Inovable through said baking and reheating chambers.

In witness whereof l have hereunto set' my hand this 19th day of November, 1918.

OTTO WUNDRACK. .Witnessess EVA STREIT FRANK D. 'l`rLoMAsoN. 

